US5385055A - Electromagnetic flowmeter - Google Patents

Electromagnetic flowmeter Download PDF

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Publication number
US5385055A
US5385055A US08/010,323 US1032393A US5385055A US 5385055 A US5385055 A US 5385055A US 1032393 A US1032393 A US 1032393A US 5385055 A US5385055 A US 5385055A
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United States
Prior art keywords
conduit
housing
electromagnetic flowmeter
magnetic field
generating means
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Expired - Lifetime
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US08/010,323
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English (en)
Inventor
Yousuke Kubota
Toshikazu Hatake
Takuya Iijima
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Toshiba Corp
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Toshiba Corp
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Publication date
Priority claimed from JP4016257A external-priority patent/JP3032068B2/ja
Priority claimed from JP4329551A external-priority patent/JP3004135B2/ja
Application filed by Toshiba Corp filed Critical Toshiba Corp
Assigned to KABUSHIKI KAISHA TOSHIBA reassignment KABUSHIKI KAISHA TOSHIBA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HATAKE, TOSHIKAZU, IIJIMA, TAKUYA, KUBOTA, YOUSUKE
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/588—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters combined constructions of electrodes, coils or magnetic circuits, accessories therefor

Definitions

  • This invention relates to electromagnetic flowmeters, and more particularly to a flowmeter having a cylindrical housing and having components integrated to mitigate many types of stress.
  • Electromagnetic flowmeters are typically inserted between two flanges of a pipe to measure a volume of fluid flowing through the pipe. Examples of known electromagnetic flowmeters will be described with reference to FIGS. 1, 2 and 3.
  • FIG. 1 One known flowmeter is shown in FIG. 1.
  • This electromagnetic flowmeter generally comprises a conduit 1, which provides a path for a fluid, and a pair of coils 2a and 2b provided on the outer surface of conduit 1.
  • the coils 2a and 2b are compressed by a core portion 5 to define a magnetic path.
  • the core 5 is connected to the conduit 1 studs 3 and screws 4.
  • Electrodes 6a and 6b protrude through oppositely disposed apertures in the conduit 1.
  • FIG. 2 Another known flowmeter is shown in FIG. 2.
  • the coils 2a and 2b are fixed in place by the cores 5a and 5b, which are connected at opposing end portions by screws 7a and 7b.
  • FIG. 3 Another known electromagnetic flowmeter is shown in FIG. 3. This type of flowmeter is disclosed in U.S. Pat. No. 4,420,982.
  • conduit 1 has end faces.
  • the conduit 1 in particular, must be designed with sufficient strength, or else be provided with some type of stiffening liner, in order to withstand this compressive force. This results in the flowmeter becoming more expensive to manufacture.
  • coils 2a and 2b be positioned against the conduit at the proper spacing relative to one another in order to measure the amount of flow of the fluid accurately.
  • an electromagnetic flowmeter has a conduit having opposite tapered end portions and a middle portion, receiving and having passed therethrough a fluid, the rate of flow of which is to be measured.
  • the flowmeter has a pair of electrodes positioned at opposite sides of the conduit.
  • a magnetic field generating means having a pair of coils and a core, generates a magnetic field in the conduit.
  • the flowmeter has a cylindrical case and a cylindrical housing.
  • the cylindrical case surrounds the conduit and has a portion which mounts the magnetic field generating means in place.
  • the cylindrical housing in turn surrounds the conduit, the magnetic field generating means and the cylindrical case.
  • the housing has a first length in the axial direction
  • the conduit has a second length in the axial direction which is less than the first length.
  • a gap is defined between the housing and the conduit.
  • An elastic ring is positioned in the gap.
  • FIG. 1 is a sectional end view showing a known flowmeter
  • FIG. 2 is a sectional end view showing another known flowmeter
  • FIG. 3 is a sectional side view showing yet another known flowmeter
  • FIG. 4 is a schematic side view broadly showing a first embodiment of the present invention.
  • FIG. 5(a) is a sectional side view of the embodiment of FIG. 4;
  • FIG. 5(b) is a sectional end view taken along line I--I of FIG. 5(a);
  • FIG. 6 is an exploded perspective view of the embodiment of FIG. 4;
  • FIG. 7 is a sectional side view showing a second embodiment of the present invention.
  • FIG. 8 is a sectional side view showing a third embodiment of the present invention.
  • FIG. 9 is an enlarged perspective view of the embodiment of FIG. 8;
  • FIG. 10(a) is a sectional side view showing a fourth embodiment of the present invention.
  • FIG. 10(b) is a sectional end view taken along line II--II of FIG. 10(a);
  • FIG. 11(a) is a sectional side view showing a fifth embodiment of the present invention.
  • FIG. 11(b) is a sectional end view taken along line III--III of FIG. 11(a).
  • FIG. 12 is a sectional side view showing a sixth embodiment of the present invention.
  • FIG. 13 is a partial sectional side view showing a seventh embodiment of the present invention.
  • FIG. 14 is a sectional side view showing an eighth embodiment of the present invention.
  • FIG. 15(a) is a partial cutaway sectional side view showing a ninth embodiment of the present invention.
  • FIG. 15(b) is a partial cutaway sectional side view showing a tenth embodiment of the present invention.
  • FIG. 16 is a sectional side view showing an eleventh embodiment of the present invention.
  • a first embodiment of an electromagnetic flowmeter A comprises a cylindrical support or case 10.
  • a pair of saddle-shaped coils 11, 12 are positioned on the outer surface of cylindrical support 10, spaced approximately 180° apart from one another.
  • a ceramic conduit 13 is coaxially disposed within the cylindrical support 10.
  • the ceramic conduit 13 has opposite tapered end portions 13a and 13b, and a middle portion 13c.
  • the tapered end portions 13a and 13b each have an end face, 13d and 13e respectively.
  • the conduit 13 includes a recessed portion 13f.
  • the recessed portion 13f is provided to make it easier to slide the ceramic conduit 13 into the support 10.
  • the conduit 13 has apertures 13g to receive electrodes 14a and 14b.
  • the end faces 13d and 13e each include a tapered corner and a short face.
  • the outer diameter of conduit 13 varies. That is, the outer diameter of end portions 13a and 13b are greater than the outer diameter of middle portion 13c. However, the inner diameter of conduit 13 is uniform throughout its length.
  • Electrodes 14a and 14b protrude through oppositely disposed apertures 13g in conduit 13 and through holes 10b in cylindrical support 10.
  • the cylindrical support 10 is coaxially mounted within a cylindrical magnetic path 16, which defines an open space between magnetic path 16 and cylindrical support 10.
  • the magnetic path 16 has two ends. One end of magnetic path 16 is engaged by a flange 10a of support 10. The other end of magnetic path 16 is engaged by another flange 17 of support 10. Further, the magnetic path 16 has holes 16a through which the electrodes 14a and 14b are inserted.
  • the flanges 17 and 10a each have tapered portions 25 at one of their corners.
  • the flanges 17 and 10a also include bosses 18, the function of which is described below.
  • the open space between magnetic path 16 and cylindrical support 10 is filled with an injected plastic mold.
  • the magnetic path 16 is coaxially mounted within a cylindrical housing 19, preferably made of Type 304 stainless steel or an equivalent material, which surrounds and protects the magnetic path 16, saddle-shaped coils 11, 12, cylindrical support 10 and conduit 13.
  • Each end of housing 19 is partially closed by an annular flanges 19a and 22, respectively.
  • the flanges 19a and 22 include recesses 24a and 24b, respectively.
  • flanges 19a and 22 are positioned by bosses 18, and welded to the housing 19. With the flanges attached, the housing 19 has a selected length, which is greater than the length of conduit 13.
  • the positioning of bosses 18 in flanges 19a and 22 functions to set magnetic path 16, cylindrical support 10, and electrodes 11 and 12 in position.
  • Each flange 19a and 22 has an extending lip 23, having an inner face.
  • Each extending lip 23 defines an opening having a diameter which generally matches the inner diameter of conduit 13, defining a flow path therethrough.
  • the inner diameter is 50 mm.
  • O-rings 20a and 20b are provided between flanges 19a and 22 and end portions 13a and 13b, respectively, of conduit 13.
  • Similar O-rings 21a and 21b are provided between conduit 13, flanges 17 and 10, and flanges 22 and 19a, respectively.
  • the O-rings provide a water-tight seal in the assembled electromagnetic flowmeter, and help maintain the spacing between the conduit and other components.
  • conduit 13 is not physically joined to housing 19.
  • the conduit 13 is maintained in its position by the presence of annular flanges 19a, 22, and O-rings 20a and 20b.
  • conduit 13 is spaced from flanges 17 and 10a, and flanges 22 and 19a, by O-rings 21a and 21b.
  • the length of conduit 13 is shorter than the length of housing 19 by the width of extending lips 23 of the annular flanges, and by the 0.5 mm gaps.
  • the electromagnetic flowmeter in this embodiment is mounted between opposing pipe flanges 29 and 30 of a pipe.
  • Bolts 31 pass between the pipe flanges. Compressive forces created by the torque of the bolts are applied via the pipe flanges 29, 30 to the flanges 19a and 22, which are welded to the housing 19.
  • fluid flows through the electromagnetic flowmeter via the pipes, the openings in annular flanges 19a and 22, and the conduit 13.
  • the amount of flow is measured by the flowmeter according to known principles.
  • conduit 13 do not abut flanges 29, 30, or the inner surface of extending lip 23 of annular flanges 19a and 22.
  • the axial compressive force of the pipe flanges 29 and 30, under normal operating conditions should be absorbed by housing 19 via annular flanges 19a and 22.
  • any compressive force applied to housing 19 in a direction transverse to the axial direction should be absorbed by housing 19, magnetic path 16, and cylindrical casing 10. Under normal operating loads, no compressive force is absorbed by the ceramic conduit 13. Hence, no compression or deformation of conduit 13 should occur.
  • the inventors have calculated the change in the axial length of the flowmeter housing caused by application of the axial compressive force by the pipe flanges. According to the calculation, the maximum reduction in housing length, which would be caused by excessive force (i.e. greater than normal operating force) is 0.16 mm. Because the compressive force is applied at each end of the housing 19, an approximate length reduction of 0.08 mm would occur at each end of the housing 19. However, since the ends of conduit 13 are separated from the inner surface of the housing flanges by a gap of 0.5 mm, the housing flanges still should not come into contact with the ends of the conduit. Therefore, it appears that under normal operating conditions, all of the compressive force applied by the pipe flanges will be absorbed by the housing, and none of the compressive force will be shared with the conduit 13.
  • a second embodiment will be described with reference to FIG. 7.
  • the second embodiment is similar to the first embodiment, as described above, with one exception.
  • the conduit 13 includes middle portion 13c having an external diameter which is smaller than the external diameter of end portions 13a and 13b.
  • the middle portion 13c extends for a substantial portion of the overall length of conduit 13 in the electromagnetic flowmeter shown in FIG. 5(a).
  • the conduit 13 in the second embodiment of an electromagnetic flowmeter depicted in FIG. 7, includes a groove 13h in middle portion 13c, of reduced external diameter, which extends for only a very minor portion of the overall length of conduit 13.
  • the groove 13h is used for placement of wire leads.
  • a third embodiment of this invention will be described with reference to FIGS. 8 and 9.
  • the third embodiment is similar to the first embodiment with one significant exception.
  • each flange includes an inner ring 40 having bottom openings 40a for bolts 42 and an outer or ground ring 41.
  • the ground ring 41 is bolted to the inner ring 40 with bolts 42.
  • the inner ring 40 in turn is positioned by the bosses 18, and welded to the housing 19.
  • the ground ring 41 takes the place of the extending lip 23 shown in FIG. 5(a).
  • the ground ring 41 has an inner surface. A 0.5 mm gap is provided between end faces 13d and 13e of conduit 13 and the inner surface of each ground ring 41.
  • the embodiment of FIG. 8 differs from the embodiment of FIG. 5(a) only in that the outer surface of each ground ring 41 abuts against the pipe flanges 29 and 30. Hence, the axial compressive force transmitted via the pipe flanges 29 and 30 is absorbed by the ground ring 41, inner ring 40, and housing 19. Under normal loads, no compressive force is transmitted to or absorbed by ceramic conduit 13.
  • Removing the ground ring also effectively shortens the length of the housing by an amount equal to the thickness of the ground ring.
  • the overall length of the housing is only greater than the length of the conduit by approximately 1 mm (i.e. 2 ⁇ 0.5 mm gap).
  • a fourth embodiment will be described with reference to FIGS. 10(a) and 10(b).
  • the fourth embodiment is similar to the second embodiment with one exception.
  • coils 11 and 12 are wrapped around respective cores 43, which are formed of a ferromagnetic material.
  • a fifth embodiment will be described with reference to FIGS. 11(a) and 11(b).
  • the fifth embodiment has a housing with end flanges and ground rings. In this respect, it is similar to the third embodiment.
  • the conduit 13 of this embodiment is not made of ceramic material.
  • the conduit 13 can be made, for example, of plastic or any number of like materials.
  • a protective lining 49 for example a teflon lining, is provided to cover the inner surface of the conduit 13.
  • the ends of teflon lining 49 are anchored in the gap between a step portion 41a of the ground ring 41 and inner ring 40 of the end flanges.
  • a sixth embodiment will be described with reference to FIG. 12.
  • the sixth embodiment is similar to the fifth embodiment.
  • the shape of conduit 13 differs in that the fifth embodiment is configured with a short middle portion 13c, whereas the sixth embodiment is configured with a longer middle portion 13c.
  • the electromagnetic flowmeter has a more significant distinction in the overall length of conduit 13.
  • Each of the previous embodiments included a 0.5 mm gap between the end faces 13d and 13e of conduit 13, and the inner surface of flanges 19a and 22 (or ground ring 41).
  • the overall length of conduit 13 in the sixth embodiment is greater than in the previous embodiments. No 0.5 mm gap is present.
  • the length of the housing is greater than the length of the conduit by an amount approximately equal to 2 ⁇ the thickness of the ground ring. Referring to FIG. 12, it can be observed that end faces 13d and 13e abut teflon liner 49, which in turn abuts the inner surface of ground ring 41. Hence, a reduction in the longitudinal length of the housing under normal operating loads would appear to permit transmission of some slight axial compressive force to the conduit 13.
  • the seventh embodiment comprises a cylindrical support (not shown), a housing 50 with a coil 50a, ground flanges 51a and 51b, and a conduit 52.
  • the ground flanges 51a and 51b are attached at both ends of the case 50 by screws (not shown).
  • the conduit 52 is provided in a cylindrical space which is formed by the inner faces of housing 50 and ground flanges 51a and 51b.
  • the conduit 52 has opposite tapered end portions 53a and 53b and a middle portion 53c.
  • O-rings 54a and 54b are provided between the inner faces and the portions 53a and 53b.
  • the O-rings 54a and 54b are made of an elastic material, such as rubber.
  • the caliber of housing 50 is larger than the external diameter of conduit 52. Further the length of conduit 52 is shorter than the distance between ground flanges 51a and 51b.
  • the O-rings 54a and 54b are provided with the portions 53a and 53b at both ends of conduit 52, respectively.
  • the conduit 52 is held between ground flanges 51a and 51b under a preset pressure.
  • a gap is formed between the surface of conduit 52 and the inner faces of housing 50 and ground flanges 51a and 51b.
  • conduit 52 When the temperature of fluid which flows through the conduit 52 changes rapidly, the shapes of conduit 52 and case 50 change under different expansion coefficients, respectively. However, once again, such a change in length of housing 50 will not affect conduit 52, because O-rings 54a and 54b provided between the conduit 52 and housing 50 absorb the effect due to the change in length of housing 50.
  • the housing 50 has extending ends 60a and 60b.
  • the extending ends 60a and 60b have inner faces which act as ground flanges.
  • the conduit 52 has a recess 61 for providing the coil 50a at the middle portion and opposite tapered end portions 53a and 53b.
  • the tapered end portions 53a and 53b each have an end face 53c and 53d, respectively.
  • O-rings 54a and 54b are provided between the extending ends 60a and 60b and end portions 53a and 53b of conduit 52.
  • O-rings 54a and 54b are provided between the inner faces of housing 50 and the end portions 53a and 53b (see e.g. FIG. 12).
  • O-rings 54a and 54b are expanded to fill the space between the end faces 55a and 55b of conduit 52 and ground flanges 51a and 51b, respectively.
  • This embodiment is similar to the seventh embodiment with one exception.
  • the surfaces of opposite tapered end portions 53a and 53b are flat.
  • the end portions 53a and 53b are arcuate.
  • flange 19a is replaced by a flange portion formed as a unitary part with housing 70. Flange 22 is still attached separately and welded. Consequently, the embodiment shown in FIG. 16 can be assembled quickly and easily.
  • the coils are fixed in place between the cylindrical casing and the magnetic path, which in turn are connected to flanges and fixed with bosses to the flanges of the housing.
  • no compressive force need be applied by connection of the cores, as in the related art, to fix the coils in the proper position.
  • the compression formerly applied by the coils is not present, and the conduit is not deformed.
  • the presence of the bosses further enables the flowmeter to be easily assembled, with the coils and flanges in the proper position, without use of special tools or skilled labor.
  • the cylindrical casing and magnetic path form an additional protective cover for the conduit, which is also not present in previous flowmeters.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
US08/010,323 1992-01-31 1993-01-28 Electromagnetic flowmeter Expired - Lifetime US5385055A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP4016257A JP3032068B2 (ja) 1992-01-31 1992-01-31 電磁流量計検出器
JP4-016257 1992-01-31
JP4-329551 1992-12-09
JP4329551A JP3004135B2 (ja) 1992-12-09 1992-12-09 電磁流量計

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US08/010,323 Expired - Lifetime US5385055A (en) 1992-01-31 1993-01-28 Electromagnetic flowmeter

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US (1) US5385055A (ko)
EP (1) EP0554059B1 (ko)
KR (1) KR0133502B1 (ko)
CN (1) CN1071453C (ko)
AU (1) AU659906B2 (ko)
DE (1) DE69332128T2 (ko)

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US5526698A (en) * 1992-09-30 1996-06-18 Hitachi, Ltd. Capacitance type electromagnetic flowmeter
US5915280A (en) * 1995-10-27 1999-06-22 Yamatake Corporation Electromagnetic flowmeter
US20040005738A1 (en) * 1993-12-27 2004-01-08 Hyundai Electronics America Sea-of-cells array of transistors
US20050229712A1 (en) * 2004-04-20 2005-10-20 Baudendistel Thomas A Magnetostrictive fluid-pressure sensor
US20060096391A1 (en) * 2003-12-11 2006-05-11 Fred Kappertz Magnetic-inductive flow sensor and method for its manufacture
US20060162465A1 (en) * 2004-12-21 2006-07-27 Endress + Hauser Flowtec Ag In-line measuring device with measuring tube and method for manufacture thereof
US20090260453A1 (en) * 2008-04-18 2009-10-22 Smc Kabushiki Kaisha Electromagnetic flowmeter
US20090293635A1 (en) * 2008-05-28 2009-12-03 Kabushiki Kaisha Toshiba Electromagnetic flow meter
US20110314931A1 (en) * 2010-06-28 2011-12-29 Takuya Iijima Electromagnetic flow meter
US8806956B2 (en) 2012-05-16 2014-08-19 Rosemount Inc. Fastening system for magnetic flowmeter liner
WO2015142532A1 (en) * 2014-03-18 2015-09-24 Rosemount Inc. Improved magnetic core configuration for magnetic flowmeters
US20170261358A1 (en) * 2014-11-13 2017-09-14 Kabushiki Kaisha Toshiba Electromagnetic flowmeter
CN111742196A (zh) * 2017-12-29 2020-10-02 Abb瑞士股份有限公司 电磁流量计上的夹具
US20210396556A1 (en) * 2018-10-30 2021-12-23 Abb Schweiz Ag An electromagnetic flowmeter with adjustable coil and shield assembly

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DE19845346C2 (de) * 1998-10-02 2001-10-18 Abb Patent Gmbh Durchflussmeßaufnehmer, insbesondere induktiver Durchflussmeßaufnehmer
DE102007003614A1 (de) * 2006-07-26 2008-01-31 Endress + Hauser Flowtec Ag Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums in einer Rohrleitung
DE102007004828B4 (de) * 2007-01-31 2013-02-07 Ifm Electronic Gmbh Kompaktes, modular aufgebautes magnetisch induktives Durchflussmessgerät und Verfahren zur Herstellung eines solchen Durchflussmessgerätes
DE102007004827B4 (de) 2007-01-31 2012-04-12 Ifm Electronic Gmbh Kompaktes magnetisch induktives Durchflussmessgerät
CN101315294B (zh) * 2008-07-07 2010-04-14 天津天仪集团仪表有限公司 电磁流量计传感器的带磁轭的一体化励磁铁芯
DE102009002053A1 (de) * 2009-03-31 2010-10-07 Endress + Hauser Flowtec Ag Magnetisch-induktive Durchflussmesseinrichtung
JP6020492B2 (ja) 2014-03-12 2016-11-02 横河電機株式会社 電磁流量計
US9410830B2 (en) * 2014-06-30 2016-08-09 Micro Motion, Inc. Magnetic flowmeter flowtube assembly with interchangeable liner/electrode module
CN104121953A (zh) * 2014-07-02 2014-10-29 重庆川仪自动化股份有限公司 一种剩磁励磁电磁流量计
CN109555920A (zh) * 2017-09-26 2019-04-02 西安国仪测控设备有限公司 一种陶瓷衬里的高压电磁流量计和方法
JP6940437B2 (ja) * 2018-03-13 2021-09-29 アズビル株式会社 電磁流量計

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US4641536A (en) * 1984-06-29 1987-02-10 Danfoss A/S Electromagnetic flow meter

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5526698A (en) * 1992-09-30 1996-06-18 Hitachi, Ltd. Capacitance type electromagnetic flowmeter
US20040005738A1 (en) * 1993-12-27 2004-01-08 Hyundai Electronics America Sea-of-cells array of transistors
US5915280A (en) * 1995-10-27 1999-06-22 Yamatake Corporation Electromagnetic flowmeter
US7178407B2 (en) * 2003-12-11 2007-02-20 Endress + Hauser Flowtec Ag Magnetic-inductive flow sensor and method for its manufacture
US20060096391A1 (en) * 2003-12-11 2006-05-11 Fred Kappertz Magnetic-inductive flow sensor and method for its manufacture
US20050229712A1 (en) * 2004-04-20 2005-10-20 Baudendistel Thomas A Magnetostrictive fluid-pressure sensor
US7104137B2 (en) * 2004-04-20 2006-09-12 Delphi Technologies, Inc. Magnetostrictive fluid-pressure sensor
US7921735B2 (en) 2004-12-21 2011-04-12 Endress + Hauser Flowtec Ag In-line measuring device with measuring tube
US7627939B2 (en) * 2004-12-21 2009-12-08 Endress + Hauser Flowtec Ag In-line measuring device with measuring tube and method for manufacture thereof
US20100037703A1 (en) * 2004-12-21 2010-02-18 Endress + Hauser Flowtec Ag In-line measuring device with measuring tube and method for manufacture thereof
US20060162465A1 (en) * 2004-12-21 2006-07-27 Endress + Hauser Flowtec Ag In-line measuring device with measuring tube and method for manufacture thereof
US20090260453A1 (en) * 2008-04-18 2009-10-22 Smc Kabushiki Kaisha Electromagnetic flowmeter
US8127622B2 (en) * 2008-04-18 2012-03-06 Smc Kabushiki Kaisha Electromagnetic flowmeter having a detachable measuring tune from the body
US20090293635A1 (en) * 2008-05-28 2009-12-03 Kabushiki Kaisha Toshiba Electromagnetic flow meter
US8082803B2 (en) * 2008-05-28 2011-12-27 Kabushiki Kaisha Toshiba Electromagnetic flow meter having a cut groove formed in the flange for holding the liner in position
US20110314931A1 (en) * 2010-06-28 2011-12-29 Takuya Iijima Electromagnetic flow meter
US8806956B2 (en) 2012-05-16 2014-08-19 Rosemount Inc. Fastening system for magnetic flowmeter liner
WO2015142532A1 (en) * 2014-03-18 2015-09-24 Rosemount Inc. Improved magnetic core configuration for magnetic flowmeters
US9631962B2 (en) 2014-03-18 2017-04-25 Rosemount Inc. Magnetic core configuration for magnetic flowmeters having a plurality of layers of magnetically permeable material
US20170261358A1 (en) * 2014-11-13 2017-09-14 Kabushiki Kaisha Toshiba Electromagnetic flowmeter
CN111742196A (zh) * 2017-12-29 2020-10-02 Abb瑞士股份有限公司 电磁流量计上的夹具
US11493373B2 (en) * 2017-12-29 2022-11-08 Abb Schweiz Ag Clamp on electromagnetic flowmeter for determining flow in a pipe using leakage current compensation
US20210396556A1 (en) * 2018-10-30 2021-12-23 Abb Schweiz Ag An electromagnetic flowmeter with adjustable coil and shield assembly
US11860012B2 (en) * 2018-10-30 2024-01-02 Abb Schweiz Ag Electromagnetic flowmeter with adjustable coil and shield assembly

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CN1076778A (zh) 1993-09-29
DE69332128T2 (de) 2003-03-27
EP0554059B1 (en) 2002-07-24
KR0133502B1 (ko) 1998-04-23
AU659906B2 (en) 1995-06-01
DE69332128D1 (de) 2002-08-29
AU3211793A (en) 1993-08-19
EP0554059A2 (en) 1993-08-04
EP0554059A3 (en) 1995-08-09
CN1071453C (zh) 2001-09-19

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